Tag: M.W=350-400

Murugesan, Kathiravan published the artcileNickel-catalyzed stereodivergent synthesis of E- and Z-alkenes by hydrogenation of alkynes, Formula: C22H23BO4, the publication is ChemSusChem (2019), 12(14), 3363-3369, database is CAplus and MEDLINE.

A convenient protocol for stereodivergent hydrogenation of alkynes to E- and Z-alkenes R¹CH=CHR² [R¹ = Ph, 4-ClC₆H₄, 4-BrC₆H₄, etc.; R² = Et, 4-EtC₆H₄, 4-H₂NC₆H₄, etc.; stereo = E, Z] by using nickel catalysts was developed. Simple Ni(NO₃)₂·6H₂O as a catalyst precursor formed active nanoparticles, which were effective for the semihydrogenation of several alkynes with high selectivity for the Z-alkene (Z/>99:1). Upon addition of specific multidentate ligands (triphos, tetraphos), the resulting mol. catalysts were highly selective for the E-alkene products (E/Z>99:1). Mechanistic studies revealed that the Z-alkene-selective catalyst was heterogeneous whereas the E-alkene-selective catalyst was homogeneous. In the latter case, the alkyne was first hydrogenated to a Z-alkene, which was subsequently isomerized to the E-alkene. This proposal was supported by d. functional theory calculations

ChemSusChem published new progress about 1448637-05-5. 1448637-05-5 belongs to esters-buliding-blocks, auxiliary class Alkynyl,Boronic acid and ester,Benzene,Ester,Boronate Esters,Boronic Acids,Boronic acid and ester,, name is Methyl 4-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethynyl)benzoate, and the molecular formula is C22H23BO4, Formula: C22H23BO4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Li, Xiao published the artcileDirected Self-Assembly of Colloidal Particles onto Nematic Liquid Crystalline Defects Engineered by Chemically Patterned Surfaces, Related Products of esters-buliding-blocks, the publication is ACS Nano (2017), 11(6), 6492-6501, database is CAplus and MEDLINE.

In exploiting topol. defects of liquid crystals as the targeting sites for trapping colloidal objects, previous work has relied on topog. features with uniform anchoring to create defects, achieving limited d. and spacing of particles. We report a generalizable strategy to create topol. defects on chem. patterned surfaces to assemble particles in precisely defined locations with a tunable interparticle distance at nanoscale dimensions. Informed by exptl. observations and numerical simulations that indicate that liquid crystals, confined between a homeotropic-anchoring surface and a surface with lithog. defined planar-anchoring stripes in a homeotropic-anchoring background, display splay-bend deformation, we successfully create pairs of defects and subsequently trap particles with controlled spacing by designing patterns of intersecting stripes aligned at 45° with homeotropic-anchoring gaps at the intersections. Application of elec. fields allows for dynamic control of trapped particles. The tunability, responsiveness, and adaptability of this platform provide the opportunities for assembly of colloidal structures toward functional materials.

ACS Nano published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Murugesan, Kathiravan published the artcileMonodisperse nickel-nanoparticles for stereo- and chemoselective hydrogenation of alkynes to alkenes, Application of Methyl 4-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethynyl)benzoate, the publication is Journal of Catalysis (2019), 372-377, database is CAplus.

The use of monosaccharides for the preparation of novel nickel nanoparticles (NP), which constitute selective hydrogenation catalysts has been reported. For example, immobilization of fructose and Ni(OAc)₂ on silica and subsequent pyrolysis under inert atm. produced graphitic shells encapsulated Ni-NP with uniform size and distribution. Interestingly, fructose acts as structure controlling compound to generate specific graphitic layers and the formation of monodisperse NP. These nanoparticles enable the hydrogenation of a series of functionalized and structurally diverse aromatic, heterocyclic and aliphatic alkynes R¹CCR² (R¹ = 1-hydroxyoct-8-yl, Ph, cyclohexyl, benzothiophen-3-yl, etc.; R² = H, Et, Ph, 1,3-dioxo-1,3-dihydro-2-benzofuran-5-yl, etc.) to the corresponding alkenes R¹CH=CHR² with excellent stereo- (98-100% Z-alkene formation) and chemoselectivity.

Journal of Catalysis published new progress about 1448637-05-5. 1448637-05-5 belongs to esters-buliding-blocks, auxiliary class Alkynyl,Boronic acid and ester,Benzene,Ester,Boronate Esters,Boronic Acids,Boronic acid and ester,, name is Methyl 4-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethynyl)benzoate, and the molecular formula is C22H23BO4, Application of Methyl 4-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethynyl)benzoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics